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Acquisitions (Narrative) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 03, 2017
USD ($)
$ / shares
shares
Jul. 15, 2016
USD ($)
May 05, 2016
USD ($)
shares
Jan. 02, 2016
USD ($)
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Business Acquisition [Line Items]                
Shares issued pursuant to acquisition           $ 114,478 $ 5,509  
Goodwill         $ 139,124 139,124 73,541 $ 75,042
Earn-out liability         1,200 1,200    
Premises and equipment sold           21  
Allowance for loan losses         24,025 24,025 26,023 23,781
Total assets         4,528,620 4,528,620 3,466,546 3,614,862
Total deposits         3,644,330 3,644,330 2,872,020 2,947,353
Total loans         3,375,976 3,375,976 $ 2,598,134 $ 2,710,712
Bankingport, Inc. [Member]                
Business Acquisition [Line Items]                
Total purchase price       $ 2,200        
Payments for acquisition       $ 700        
Shares issued pursuant to acquisition, shares | shares       79,012        
Shares issued pursuant to acquisition       $ 1,500        
Payment for purchase of office space       1,100        
Goodwill       1,700        
Other amortizable intangible assets       $ 700        
SBA Complete, Inc. [Member]                
Business Acquisition [Line Items]                
Total purchase price     $ 8,500          
Payments for acquisition     $ 1,500          
Shares issued pursuant to acquisition, shares | shares     199,829          
Shares issued pursuant to acquisition     $ 4,000          
Goodwill     5,600          
Other amortizable intangible assets     2,000          
Earn-out liability     $ 3,000          
Earn-out liability payment period     3 years          
Measurement period adjustment for earn-out liability and goodwill         $ 1,200      
First Community Bank branches [Member]                
Business Acquisition [Line Items]                
Goodwill   $ 5,400            
Loans sold   150,600            
Premises and equipment sold   5,700            
Deposits sold   134,300            
Deposit premium   3,800            
Allowance for loan losses   1,000            
Write off of goodwill   3,500            
Gain loss on acquisition   1,500            
Acquired assets fair value   157,200            
Premises and equipment   3,400            
Other liabilities   200            
Discount on acquired loans   1,500            
Premium on deposits   300            
Core deposit intangible   1,200            
Total deposits   111,300            
Total loans   $ 152,200            
Carolina Bank [Member]                
Business Acquisition [Line Items]                
Payments for acquisition $ 25,300              
Shares issued pursuant to acquisition, shares | shares 3,799,471              
Shares issued pursuant to acquisition $ 114,478              
Goodwill 65,302              
Premises and equipment 17,967              
Other liabilities 12,855              
Core deposit intangible              
Payments for acquisition per share | $ / shares $ 20.00              
Merger share conversion ratio 1.002              
Contribution of cash in total consideration 25.00%              
Contribution of stock in total consideration 75.00%              
Closing stock price | $ / shares $ 30.13              
Carolina Bank [Member] | Post Merger [Member]                
Business Acquisition [Line Items]                
Merger Related Expenses           3,200    
Carolina Bank [Member] | Pre Merger [Member]                
Business Acquisition [Line Items]                
Merger Related Expenses           $ 4,600    
Carolina Bank [Member] | Borrowings [Member]                
Business Acquisition [Line Items]                
Useful life of acquired intangible assets 18 years              
Carolina Bank [Member] | Deposit Liabilities [Member]                
Business Acquisition [Line Items]                
Useful life of acquired intangible assets 5 years              
Carolina Bank [Member] | Core Deposit Intangible [Member]                
Business Acquisition [Line Items]                
Useful life of acquired intangible assets 7 years